This part is a kind of semiconductor called C4554.

Function of this product has 2SC4554.

Manufacturers : NEC

Image and pinout :

Some of the text within the PDF file :

DATA SHEET SILICON POWER TRANSISTOR 2SC4554 NPN SILICON EPITAXIAL TRANSISTOR FOR SWITCHING The 2SC4554 is a power transistor designed especially for low PACKAGE DRAWING (UNIT: mm) collector saturation voltage and features large current switching at a low power dissipation. In addition, a high hFE enables alleviation of the driver load. FEATURES • High hFE and low VCE(sat): hFE ≅ 800 (VCE = 2 V, IC = 5 A) VCE(sat) ≅ 0.12 V (IC = 5 A, IB = 0.05 A) • On-chip C to E damper diode • Mold package that does not require an insulating board or insulation bushing ABSOLUTE MAXIMUM RATINGS (Ta = 25°C) Parameter Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current (DC) Collector current (pulse) Base current (DC) Total powe [ ... ]

C4554 PDF Datasheet Download